His outfit MAY look like an overall, but if you think about it, that's not possible. I mean, there is an opening at the from of his top, which is quite obvious. If it really was an overall and only opens from his neck down to his mid-belly area, he WILL NOT BE ABLE TO GET INTO IT. Therefore, from the pov of a professional tailor, he wears a hoodie that is tucked into his pants of the same color.
I just wish i had more fabric so the pants could be baggy.